Reinforcement for pneumatic tires.



A. L. MURRAY. REINFORCEMENT FOR PNEUMATIC TIRES.

APPLICATION FILED JUNE 28. 1909.

9 16,55? Patnted Jan. 18,1910.

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Specification of Letters Patent. Patented Jan. 18, 1910- Application filed June 28, 1909. Serial No. 504,907;

To all whom it may concern:

Be it known that I, ALBERT Lmn MURRAY, a c' izen' of the United StatesQresiding at Gra d Ra ids, in the county uf Kent and State of v ichigan, have invented certain new and useful Improvements in Reinforcements for Pneumatic Tires, of which the following is a specification. My invention relates to improvements in pneumatic tires for use upon automobiles and kindred vehicles, and more particularly tires, audits objects are: First, to provide a reinforcement to be placed between the inner tubeand the casing of a pneumatic tire-in suchamanner that the inner tube will be fully protected from injury from any puncturing object that may.be forced through the casing, Second, to provide a reinforcement of the class stated that is soconstructed that it will be automatically adjusted to the size and contour of the casing Third, to provide a reinforcing element in pneumatic tires that willallow of the easy and convenient insertion of the inner tube. Fourth, to so arrange the fabric portion of the reinforcing tube as toraise its powers of resistance to the highest efiiciency. I attain these objects by the mechanism illustrated in the accompanying drawing, in which Figure 1 is a cross section of a tire showing the reinforcing portion open and overlapping at the tread of the tire, and with the inner tube in place. Fig. 2 is a modified form of the same with the overlapping portion of the reinforcement at the base of the tire, and Fig. 3. indicates the manner of laying up the fabric for strengthening the re- 1n orcing element.

Similar letters and figures of reference refer to similar parts throughout the several view's.

This reinforcement is designed for use, preferably, with clencher casings and is made open, longitudinally the entire length of the reinforcing tube C. With an ordi-,

nary-clencher tire, the inner tube B is likely to become clamped between the meeting edges, (1, of the casing A with the result that its expansible qualities are thereby greatlyrestric'ted, and it is liable to become punctured eitherat this line by reason of the extremely heavy pressure between these edges, or by reason of -too great pressure .WllillllIl the tube without the supporting sure alternating interlocking ribs,

' in rubber,

-of fabric,

use of three plies or layersof fabric, as.in-

reinforcing elements.

a sufiicient amount of the inner tube being properly. To avert this danger I place a reinforcingtube 0 inside of the casing A. This tube is left open the entire length of either the outer or the inner periphery, as indicated at c c in Figs. 1 and 0 0 of Fig. 2, so that the inner tube B may be readily inserted. I make the overlapping ends or edges of this reinforcing tube much thicker than the balance, and serrate or form so arranged that when the inner tube Bis inflated these surfaces will become interlocked in such a face of the casing, prevented by reason; of,

manner that it will be impossible for them '7 to slip laterally, to any extent, yet so arranged that they will adjust themselves sufficiently to meet the full required expansion of the inner tube B and form a perfect bean.

ing over the entireinner surface of the cas1n-g.-

I prefer that the reinforcing tube C be made up with strong fabric layers, as indicated at C, strengthened and well planted fabric reinforcement of two or more layers as l, 2, 3, in Fig. 3. I prefer the dicated in Fig. 3, for this purpose, and so arrangethe layers that the Warp and Woof of each will be-upon a dilferent an le from the others as, for instance, 'in Fig. shown the fabric at 1 out so that the downwardly angling warp inclining to the right, stands at an angle of about 30 degrees from the perpendicular while at 2 the incline shows about forty five degrees from the perpendicular, and at 3 the angle would inclicate about sixty degrees from the perpendicular, which so distributes the incline of the warp and woof of the layers that the threads will be so crossed and interin the usual manner of making tire casings, and for this purpose I make the I have crossed that it will be impossible for any puncturing article topass through them Without cutting several threads in one or more of the layers. This is especially sure when these fabric layers hae been thoroughly impregnated with, and are firmly supported by the rubber that forms the 1mportant element in the construction of these tubes may be cut in short lengths, ifdcsired, and used to cover short distances immedi- These reinforcing ately adjacent to a puncture, which would render them very etlicient for temporary use in closing difticult punctures when one has no repair kit at hand with which to remove the inner tube and place the entire rein torcing tube in the case.

For new work where the reinforcing tube and the inner tube 13 are inserted before the tire is placed upon the rim 1), I prefer the use of the reinforcing tube shown in Fig. 1 as it greatly strengthens the tire at the tread, where punctures are most liable to occur, but for repair work. especially upon the road where the needed implements for this line of repair are not at hand, I prefer the form shown in Fig. 2 as it is much more convenient to enter this tornr, especially when short pieces are used for temporary repairs, as intimated earlier in the specifications.

By clencher tires,"'hereinbefone mentioned, is meant any tire that is opened the entire length of the inner periphery for the ready insertion of an inner tube, whether the tire casing is secured to the rim D by the ordinary clencher formation, or by bolts, retaining wires or otherwise.

The overlapping edges of the reinforcing tube C should be so constructed that they 1 will render or slide upon each other when light pressure is exercised upon them durproduced, as when the inner tube is fully the use of the formations shown, and particularly that shown in Fig. 1, without any other element, or a proper cement may be used if desired.

What I claim as new, and desire to-secure by Letters Patent of the United States, is:

1.. In combination with the casing and the inner tube of a pneumatic tire, an intermediate tube opened and overlapped along the entire length of its periphery, said overlap-- ping portions made to interlock to form, under pressure, an air tight connection, and several thicknesses of reinforcing t'abric having" the warp and wootat various angles and fully impregnated with and made a part of the material of which the tube is made.

2. In combination with the casing and inner tube of a pneumatic tire. a reinforcing tube having a peripheral opening its entire length. overlapping surfaces along the line of said opening, interlocking serrations upon said overlappingsurfaces, and a reinforcing element in said tube consisting of several layers of fabric cut and placed so that the warp and woof of each layer will be at a ditl'erent angle from those'in the others and all the layers fully impregnated with the rubber element of the tube.

Signed at Grand Rapids Michigan June 1 2c, 1909. ing the inflatlon of the mner tube, but will I become mnnoyable when heavy pressure is inflated, and this may be brought about by ALBERT LINN MURRAY. in presence ot-- T. L. S'rnwAn'r, 1. J. Cinnnr. 

